|Competitor for Greece|
|World Championships (LC)|
|Gold||2005 Montreal||50 m backstroke|
|European Championships (LC)|
|Gold||2008 Eindhoven||50 m backstroke|
|Gold||2012 Debrecen||100 m backstroke|
|Silver||2006 Budapest||50 m backstroke|
|Silver||2008 Eindhoven||100 m backstroke|
|Bronze||2006 Budapest||100 m backstroke|
|Gold||2005 Almería||50 m backstroke|
|Gold||2005 Almería||100 m backstroke|
|Silver||2009 Pescara||100 m backstroke|
|Silver||2009 Pescara||4x100 m medley|
|Bronze||2005 Almería||4×100 m freestyle|
|Bronze||2009 Pescara||4x100 m freestyle|
Grigoriadis was the first Greek swimmer to be crowned world champion in the 50 m backstroke event of the 2005 World Championships in Montreal. At the European Championships of Eindhoven in 2008, he won two medals: the gold in 50 m backstroke and the silver in 100 m backstroke.
He participated at the 2012 Olympic Games in the 100 m backstroke event, in which he reached the semifinals, taking the 14th place.
- "Aristeidis Grigoriadis". Olympics at Sports-Reference.com. Sports Reference LLC. Retrieved 17 May 2010.
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